Question

A candidate is
selected for interview for 3 posts. For the first post, there are 3 candidates,
for the second, 4 and for the third post there are 2 candidates. What is the
probability that the candidate is selected for at least one post

Answer 1

probability of being selected in atleast one interview = p1+(1-p1)p2+(1-p1)(1-p2)p3
where p1, p2 ,p3 are probabilites of getting selected in 1,2,3 interviews respectively.
p1 = 1/3 p2 = 1/4 p3 = 1/2.